<template>
  <transition name="list-fade">
    <div class="playlist" @click="hide" v-show="showFlag">
      <div class="list-wrapper" @click.stop>
        <div class="list-header">
          <h1 class="title">
            <i class="icon" :class="modeIcon" @click="changeMode"></i>
            <span class="text">{{modeText}}</span>
            <span class="clear" @click="showConfirm"><i class="icon-clear"></i></span>
          </h1>
        </div>
        <scroll ref="listContent" :data="sequenceList" class="list-content" :refreshDelay="refreshDelay">
          <transition-group ref="list" name="list" tag="ul">
            <li :key="item.id" class="item" v-for="(item,index) in sequenceList"
                @click="selectItem(item,index)">
              <i class="current" :class="getCurrentIcon(item)"></i>
              <span class="text">{{item.name}}</span>
              <span @click.stop="toggleFavorite(item)" class="like">
                <i :class="getFavoriteIcon(item)"></i>
              </span>
              <span @click.stop="deleteOne(item)" class="delete">
                <i class="icon-delete"></i>
              </span>
            </li>
          </transition-group>
        </scroll>
        <div class="list-operate">
          <div @click="addSong" class="add">
            <i class="icon-add"></i>
            <span class="text">添加歌曲到队列</span>
          </div>
        </div>
        <div @click="hide" class="list-close">
          <span>关闭</span>
        </div>
      </div>
      <confirm ref="confirm" @confirm="confirmClear" text="确定要清空播放列表?" confirmBtnText="清空"></confirm>
      <song-add ref="addSong"></song-add>
    </div>
  </transition>
</template>

<script>
  import Scroll from '../base/scroll/scroll.vue';
  import Confirm from '../base/confirm/confirm.vue';
  import {playMode} from 'common/js/config.js';
  import {mapActions, mapMutations} from 'vuex';
  import {playerMixin} from 'common/js/mixin.js';
  import SongAdd from '../song-add/song-add.vue';

  export default {
    mixins: [playerMixin],
    components: {Scroll, Confirm, SongAdd},
    data () {
      return {
        showFlag: false,
        refreshDelay: 120
      };
    },
    computed: {
      modeText () {
        return this.mode === playMode.sequence ? '顺序播放' : this.mode === playMode.random ? '随机播放' : '单曲循环';
      }
    },
    watch: {
      currentSong (newSong, oldSong) {
        if (!this.showFlag || newSong.id === oldSong.id) {
          return;
        }
        this.scrollToCurrent(newSong);
      }
    },
    methods: {
      hide () {
        this.showFlag = false;
      },
      show () {
        this.showFlag = true;
        setTimeout(() => {
          this.$refs.listContent.refresh();
          this.scrollToCurrent(this.currentSong);
        }, 20);
      },
      showConfirm () {
        this.$refs.confirm.show();
      },
      confirmClear () {
        this.deleteSongList();
      },
      getCurrentIcon (item) {
        if (item.id === this.currentSong.id) {
          return 'icon-play';
        }
        return '';
      },
      selectItem (item, index) {
        if (this.mode === playMode.random) {
          index = this.playList.findIndex((song) => {
            return song.id === item.id;
          });
        }
        this.setCurrentIndex(index);
        this.setPlayingState(true);
      },
      scrollToCurrent (current) {
        const index = this.sequenceList.findIndex((song) => {
          return current.id === song.id;
        });
        this.$refs.listContent.scrollToElement(this.$refs.list.$el.children[index], 300);
      },
      deleteOne (item) {
        this.deleteSong(item);
        if (!this.playList.length) {
          this.hide();
        }
      },
      addSong () {
        this.$refs.addSong.show();
      },
      ...mapMutations({
        'setCurrentIndex': 'SET_CURRENT_INDEX'
      }),
      ...mapActions([
        'deleteSong',
        'deleteSongList'
      ])
    }
  };
</script>

<style lang="less" scoped="">
  @import "~common/css/variable.less";
  @import "~common/css/mixin.less";

  .playlist {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 200;
    background-color: @color-background-d;
    &.list-fade-enter-active, &.list-fade-leave-active {
      transition: opacity 0.3s;
      .list-wrapper {
        transition: all 0.3s;
      }
    }
    &.list-fade-enter, &.list-fade-leave-to {
      opacity: 0;
      .list-wrapper {
        transform: translate3d(0, 100%, 0);
      }
    }
    .list-wrapper {
      position: absolute;
      left: 0;
      bottom: 0;
      width: 100%;
      background-color: @color-highlight-background;
      .list-header {
        position: relative;
        padding: 20px 30px 10px 20px;
        .title {
          display: flex;
          align-items: center;
          .icon {
            margin-right: 10px;
            font-size: 30px;
            color: @color-theme-d;
          }
          .text {
            flex: 1;
            font-size: @font-size-medium;
            color: @color-text-l;
          }
          .clear {
            .extend-click();
            .icon-clear {
              font-size: @font-size-medium;
            }
          }
        }
      }
      .list-content {
        max-height: 240px;
        overflow: hidden;
        .item {
          display: flex;
          align-items: center;
          height: 40px;
          padding: 0 30px 0 20px;
          overflow: hidden;
          &.list-enter-active, &.list-leave-active {
            transition: all 0.1s;
          }
          &.list-enter, &.list-leave-to {
            height: 0;
          }
          .current {
            flex: 0 0 20px;
            width: 20px;
            font-size: @font-size-small;
            color: @color-theme-d;
          }
          .text {
            flex: 1;
            .no-wrap();
            ont-size: @font-size-medium;
            color: @color-text-d;
          }
          .like {
            .extend-click();;
            margin-right: 15px;
            font-size: @font-size-small;
            color: @color-theme;
            .icon-favorite {
              color: @color-sub-theme;
            }
          }
          .delete {
            .extend-click();
            font-size: @font-size-small;
            color: @color-theme;
          }
        }
      }
      .list-operate {
        width: 140px;
        margin: 20px auto 30px auto;
        .add {
          display: flex;
          align-items: center;
          padding: 8px 16px;
          border: 1px solid @color-text-l;
          border-radius: 100px;
          color: @color-text-l;
        }
        .icon-add {
          margin-right: 5px;
          font-size: @font-size-small-s;
        }
        .text {
          font-size: @font-size-small;
        }
      }
      .list-close {
        text-align: center;
        line-height: 50px;
        background: @color-background;
        font-size: @font-size-medium-x;
        color: @color-text-l;
      }
    }
  }
</style>
